I can't activate my iPhone 3GS after updating OS
I'd tried to keep my unlocked iPhone 3GS up to date by updating its OS from version 4.1 to 6.1
After restart, I couldn't activate my iPhone to work. It always shows a message in iTune whether it could not find a server, or sync problem.
Is it because of my iPhone unlocked? what am I suppose to do? Please help my phone back to work.
iPhone 3GS, iOS 6.0.1, unlocked